09-24-2014, 12:05 PM
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#11 (permalink)
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Base Member
Join Date: Apr 2014
Location: Colorado Springs, CO
Posts: 48
Drives: 2015 Focus ST ST3
Rep Power: 13
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Quote:
Originally Posted by 1slow370
OK ms3 girl? haltech, aem, ecutek(just not our platform) all allow for the addition of a fuel alcohol sensor, because if you tune on e85 for the most power it is all about advancing the timing as far as you can due to the increased octane of the fuel, so if you tuned the car at 70% alcohol content but then ran only 20% alcohol content you WOULD have serious problems.
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Or just keep coming across as condescending. Whatever.
That's great that you can tune for specific amounts of Eth with a sensor, but we're talking fixed amounts here. E85 has a fixed (relative) content of alcohol. I wouldn't recommend running it in the winter, as the Alcohol content is reduced for cold start purposes. The key is that you do not *NEED* a sensor. I'm specifically discussing a *PARTIAL* tank of E85 at summer blend ratios of ~83%. The content of 25% E85/75% 91 could be anywhere from 1.75-2.2 gallons on a 10 gallon tank if we account for the Alcohol content falling to 70%. thats 17.5-22% Ethanol content, and while that may seem like a large fluctuation, in the grand scheme of things the lower volatility of E85 still makes it safer than tuning with an also inexact Octane of 91.
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